2001-2004 Duramax LB7 Transmission Parts

2001-2004 Silverado & Sierra 2500 & 3500 Duramax LB7 owners rely on quality components to keep shifts crisp and reliability high. Browse Tier One's curated selection of transmission parts designed for stock rebuilds, towing, and performance builds. We offer everything from deep transmission pans that increase fluid capacity to the essential thermal bypass valves that fix factory cooling restrictions. Need help choosing the right setup? Contact Tier One or call 602-399-5484! If you are finding that you need to replace too many individual parts, it might be more cost-effective and reliable to swap the entire unit with one of our 2001-2004 Duramax LB7 Complete Transmissions. One of the most critical parts for towing performance isn't inside the transmission case, but attached to the engine, so if you are upgrading hard parts, don't forget to grab one of our heavy-duty 2001-2004 Duramax LB7 Torque Converters. While deep pans are great for holding more fluid, that fluid needs to be cooled effectively, so pair your new pan with one of our 2001-2004 Duramax LB7 Transmission Coolers. The "brain" of your transmission controls how well these parts work, so for better shift timing and reliability, look at our 2001-2004 Duramax LB7 Valve Bodies.